Architecture comparison

Cresta vs Sierra

Cresta runs closer to the foundational model (Native (own / self-hosted weights)) than Sierra (Direct API). No shared foundational model — different bets.

Cresta

CX AI

Proximity

Native (own / self-hosted weights)

Models

proprietary / self-built modelsOpenAI · GPT

Cloud · datastore

GCPvectorPostgreSQL

Compliance

SOC 2

Architecture

Contact-center AI with its own real-time coaching models plus partner LLMs over call data.

Sierra

CX AI

Proximity

Direct API

Models

Anthropic · Claude

Cloud · datastore

AWSPostgreSQLvector

Compliance

SOC 2

Architecture

Conversational-AI agents (Bret Taylor) built multi-model but Anthropic-forward.

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